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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ec21fa0c40ca5fc269c380b2cff0b7e2e0fa5a5743e10dd9c268539f73ad94' 
  AND token = '9eUQQr8UbibIC6MdbS4K5qi9JfzNP6cAakJT1okGuvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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