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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394fb7f521899ea8379b7271cbfcf6e4e6b1dc3a5bdfbc72862b48eb5c23ff83' 
  AND token = 'pSqET4IEyG+9hXl4yxCx3SMTZdbQm3/TYgPEJkHtmxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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