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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7cdd3cc5c324b86fca097c76396232830771ee84d06128d0fb06a3dac0dceb' 
  AND token = 'gn/QF2OcYe+o8Ed9CSs4e5FTc3gHPnLK0A1s6sBfgcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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