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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a672bc3ed463ff783eefd3dc8e9c8236d6c728eaaa20ea01ef12d9a6daac32' 
  AND token = 'T4jRFYJW/6qsUfNO+h4oIntTfZ7cB55DbWy25rZcnM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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