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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81846f72c0c8ac313ae9a2318deeccff411a9af74ccf39dbc270ae362b20f4cb' 
  AND token = '5CGsPrPIP3SA/Bu80a9IRHXb9gd00p4RaIuJQzzqNnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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