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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5651375e6b287459c23778514d24e247d5317e1a2b7579851017248a42e35e54' 
  AND token = 'jl8WJtN7yFEnxL6xoCuT4gm5V+5BXSH177hbqJfSITE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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