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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466062b1c02be38fedfe71fe71127392253dac2a9a498b89b004deb7fa2571ca' 
  AND token = 'Za4Bsi8AUfIS5AEyZ2K5a2GvJlO4pJrCxdhpjUba0QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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