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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d55fb2d65ab3b95ac8659e1a84710ab98ae7d616caa2b0f2498a9e0091a8810' 
  AND token = '8wl6y2Z/4TeFnu4Py8e2HJw2EIUmF6EqSeHyvrGpibo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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