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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43fe01855d0a37cdc1d48aecbb1cd4c6d296c8c3b38e6c75cd2a31d042347370' 
  AND token = 'QfzvfHcMywgyxIiymEuNvPqY4nqdNrFUDZmROX0RWko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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