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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93967320d16df803791475179c2bddc41e52e338f69a6c0bec2fd9a834cdfa5d' 
  AND token = 'Vd6KtF645y0RTBBYYDAoICftY9fkr8kiLQiPBYoL8dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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