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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae278ab5828308563223f28345c6e5bb9b51b3bfeadfb870a7e5038b36f18858' 
  AND token = '415QawraP4q8mDiq9fUCKfruCNrdFgnV8Yp6y18OdlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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