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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4ead47e8b463c845e468293cf2ebdcdf078cf67613252ad9d92ba36838678c' 
  AND token = 'A+XIIQiPnxBj2DMxvPdnohH3z55wbft8n0/YttroTPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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