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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17846b75fae1531414a987cb2608a8feeb40c2bf708f2bed8eebe199a6e6d6cb' 
  AND token = 'MdpDKChrQrtXEyPrCU9OGxWk4df/hX28MjUHiMf2QHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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