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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13ab11508a349005fda83048ed93a1e376ac78521f970586c1212e67fdb39c7' 
  AND token = 'k4c/bleHuoRUjRiARM+SxGcyyDz8u10vZvKmh77OvOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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