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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3533871a0d9d3efd57857d13602852dac957798cc612bb23be127b4f68a27586' 
  AND token = 'Cn4aAwwSt8ANVGtpfVKzKpG3Ee2uoaGxUxLSTYHe0O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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