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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b42ef0e33c66cae84e39fce8d2805650d3e607b9ad51d9651a0984de7cf91f' 
  AND token = 'f7mfrObQcsroXgvmPmn5zG1B19i9BjAc7PUBamyd4sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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