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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf4a4dcf1424d22aa0c0424a9732e772fb470224bf140e039e07a2a85af790a' 
  AND token = 'hyiS1CWdQjP82nf0frZ+eiYgrMIeHr50tgsv41IUzWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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