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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e040ccb9c3cd86de634868286431ace2e957c3623368e3c8a237657fb72c4d' 
  AND token = 'QD/xviUpAhzfy/yYKaZrIMR6tJNWnqQAb8+DL4PLVbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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