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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6485f3700b7013c3f621ed384361f7e30b44046b8aa6d216f0085e59a3157ba8' 
  AND token = 'Enu3vQfLiZQYhJ77m8E+ncMMAEEa0PpW/vUbj7tiL9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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