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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f185bea8c6b31265bcf15030c70032fefc63b5b7f9a23d829a9311e4032fb0cd' 
  AND token = 'Ji7LUV9G4Od1p4Ro/LavvsOAN2ebwBHerv/naVDK0QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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