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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fc095482a2fa6f21fdbdb30ce1c3c65983f769deea2d11e3efcdf3386ee3ac' 
  AND token = '852OLOSvSdwdB1I1WciU92a9NH+8kg3oRIFSOmQiW2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}