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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2c4c57b36e41c92720f0867f8b9d21413c648d794323c2d1c2a8e512310318' 
  AND token = 'd3AH3ahUV0KLKulITKfa2MfH4JYZzzPOA56Ym5/65ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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