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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9843d36105b2bf1318897235a06b90066592e9b1cf8fd15243edc5696e67d08f' 
  AND token = 'mt5F1brvCbS3mvosAzMiLoxfrghCzneLEHIRkwDB6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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