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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f067155c1c04c4bac2785197d60cf1e2ddf8c0918ea11c45d48a28a6dc75aba' 
  AND token = 'hjtOogq8t/QTZdr+c9NF0m4BzyNO3RHU/eRg5drFE2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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