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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179dc2904dd0174feb03616eba7e88927e7139cd226e7f29d93bad71fb87b6ba' 
  AND token = '2I+jC5NhcvNkwIik2CJ6NDcTBv8VPnXQ64vi5/eNqog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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