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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d485b9df8670712ac1df07a597806f4da74b32d64136aaa29e7a6c3da7fee6' 
  AND token = 'nmMeXTBEFWNthSdIReqg04wRilzKfVAtV6cTrcQNvjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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