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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3fc2a388091c6d1f9c3ecdb4a16318b495be8ee16b2c3ea619f684ee228883b' 
  AND token = 'znnZL5LW/DqbtWrUQYZQ9kVqq4K6J3CcnFCzMQebTfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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