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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c4f05317028d99f8d5201106d102f66e871f7e71ca52ba699e46257f300e52' 
  AND token = 'pP9HoRcZG/rcZFk7rVI7R6WnIIcmcU5DTD5cHM2hIig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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