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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b0a49787cf7eb4af5b97a0ec37f7602323951de69ddb7e22ba07bfdc5df249' 
  AND token = 'dQurWFQw+RFK6GGa5ydG1BDMlERcIFEIZ0Ls9bqcJ/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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