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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9af2793d04a3b36c7e5dd55d45c8e471345cb33a51195fcab7978e93761c84' 
  AND token = 'KUx7UzP9FOSPE0JovchSqTf16fAfDQwOU9PrhvZZw/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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