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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329807e87deaae80121e40cc702ae979ef268e7cb585651f66919ea52a6896fc' 
  AND token = 'yBhXxYDl/sHXjkG/l3X7hY6CXd/0FgwJDQYpPENJuY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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