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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74af0bb5fe9c405b5492dcac5d527ca0dea5d7e044360f7651be3d9a1b739ab7' 
  AND token = 'oGs5j+hnchaQHznyH1/WeORuoZns5ueh4xYPZVluqXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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