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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4792f3b02f1b63241c9f8fa1755bacf690050762b29da804e1136170105f6c23' 
  AND token = 'CzDyaqM6eGC/E+SYZ8cCpW0NW2ZDVS0zLmI4O88vjxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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