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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbc6cc717a6d6a8ef7c7c1ef8d2f3097988ec9da294a521b528331705798c98' 
  AND token = 'RUBpoX7iLKV98sNukaUAGcBT+zc4pGJJ4yycaJykJCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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