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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae8b57fde42034e7e711fd6740d2ebe92aea5a8ad7f4bc1130d0eccee0d2a31' 
  AND token = '0zgsnwk6dMRO1CHob4/QmSG+79CMCaAvye72zzJqCq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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