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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ebc68206cfba510be2ebe535208d6b81573ffc5de48c3b3b374a585b578308' 
  AND token = '0u1AmDo0L0nFiEvYDdVAHJIg6V9NLgonK6XHEeUY3o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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