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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b38a4afcd8c38ce9134b0a42074ead99ea68c92d763d6d0dcc0b3621ccfe6d' 
  AND token = 'bjaFKPlKWAVdvq7V43yq+AM1WBqOte4ERttZVxjQTco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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