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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd0411156d0510e60d4699aeca8fe200c17e1d67425c2be302a31a261109eb7' 
  AND token = 'ogA4DoAv7nI6icCaH5fv1msQyHjQBDDkAyAQ4oKNRAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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