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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89437e8dab315fb2406c1f42d658e6e1a76c73860852dc43ce4e5b476353092' 
  AND token = '/uKwMupn6R72ZiG1zvcnXksSeMdvw94Oamm7SWS2Oi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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