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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275c17808a68b31f26c452578ac4275dc67a68db80ec96bf5602139fe2d0e7a5' 
  AND token = 'TxSGofeolwOQXiG9qY5XyFungRf+8491daSBXi6c9CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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