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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dab60beae4d49bb98e3660add9a795c63608d05bbf88bc7b3f15140bad46473' 
  AND token = 'ySQQkpoQzl4V/B1Qkb3GAJ1cs8fQpbY6yZCy1u6RunU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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