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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c01581ac529852bee1ace1401bf57849fbbcf84a6a8da023bdfab9d2f3faad' 
  AND token = 'hJjX3Vr+e3JoIbArw/dzU+4fDFoMX84J2gCVLaMMgSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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