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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789dec0943ac90b004cd56f459a56a98caa3c82a9ae0e9a8f83601170a0ce201' 
  AND token = 'Htb4aDYDvXdTwjN4oY3ro+CWbd57SOT4i04vesLD0Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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