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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf37a00734d90b921c7af61422b4381449f84e538844d5052a75ee0531d74d2' 
  AND token = '3HW774RVeQmpEf1f8q+cPdPWsr2k6yw3ki0BUMiROM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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