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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907acad7c3c393af309b62149f51fd31c1573dba3e40f5fdd75942db28427ed5' 
  AND token = 'hIEw62riUHIl3KTNach8UukN8U2hjwg4VuVAZhR0hig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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