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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db248c74b3ae51642fa24d93caac7544a5894fcc8c2957248a21df48635f3813' 
  AND token = 'F03lSxft/A5WSInkatoOyv1lQkAlDflj33cJoEO3wwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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