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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5fc52bf71b58a43174c59715315f30425933c239052326b478f8379ece42ff' 
  AND token = '3azXM1zwti380dPaevpjdLC0WJq7hR0ak9OO+B3ELbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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