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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b9b8c203a69d1a8d39c6259341e70d8eff8c5eaa40515122babf83e23dac1b' 
  AND token = 'diM5sowI8ljQpZB5eEEDEUkGtLjHnS1QiHbKyF+Sktw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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