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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b3ff04a70b52812a226fa3d2485800294a22d6bd19af2b86e6260f7c6ef4cd' 
  AND token = 'H7KLWl2N58NA+KTqMNstlUFfhYqRpOIxWzgnipRujWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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