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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63241d0f86d5aa399d25563f8a46a42d6389958aa6a7185d3675d0a9d0e6188c' 
  AND token = '38cLvYrkMXaV1P+4zXK1A3PKNbM9fyeRqtnrWb6deR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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