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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e330d71d502d95930bc28e02011b8c9fd714e4f0ccff34eb2005bf34fb1cff3' 
  AND token = '7uKdjsSVpPxV8OrDyMhScnd+X3PRSzVoHG/4eVs2/PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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