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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333a2b56a35369afecbb885a9707ab4df10642842437ba22eeb0ae202e7853e4' 
  AND token = 'FbA4Ily1q9berGTuYViI04X0vjtZ/S1PP9h6hLg58Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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