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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bca2fc95430b772354eb3c0e5026672e71c0dc24f0b217670a71519b8a5c68' 
  AND token = '5NFR1reoBkeuVxoZTJwOU9+aqKgsocaU56Y51fn8Wno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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