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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '486614ab1c97b0eac716ff57a37b950d7a975ad9efb84e66bad93bf81a9883dd' 
  AND token = 'ByI9qre26HuUZQE7jnuCti0WZ+wist7y0tEnROlVPN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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