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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac77f606fc26f10878ec7036c2ebb5de85652bdbfb9be0025f7f238c1757b003' 
  AND token = 'KZ7OqsTlT2D9M3/bfml3wUcQkSGceS9/b10FgvihZZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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