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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dc988e0e1b2037ff034e3382ee82ac0ad66e08aa6a73b835218bd2f08f3dbb' 
  AND token = 'pJf555l6UITqCj8ZSSNIONRUyFJJQlkkI+y04UdAW6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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