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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa290669aba9e23d65937865da8e70fdf7e56010023c97ad9475c696f7c873d8' 
  AND token = '0kxBj5c4Vmgd4OAU9YE+Nzyg4hbHXK6VH1GtuX54o+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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