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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a467a7e9335637d393e64eba7564db4f25ee1edf9bef9ec4747eb029ea7e271' 
  AND token = 'QyHeaD6cGmXSMNUKdwQlwesbkblWkN4pqpjgZqA3i+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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