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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b8a2262e20d861d9b1c5194af44a15dc9367f2fd10d0cef90f7a61698510f5' 
  AND token = '822UhwR8o3Irl3ePdJ8TTGWQ5Pf8JEzMw9UsdTHz0UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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