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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41cfb6a753d46d434a6e62521c513cbc56484a4337e8fe4f79d53303b2a8d33' 
  AND token = 'r5mqkGIITFljS+cAcsz8yoa6ONvnZ0v36/Y1exXcmlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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