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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824e5cc54db1b289278008d7f2b546b794673e4a9bdf928cab641dfc9056b85d' 
  AND token = 'jJAWLzWdPUY8EEL0V8M3p/ib0Ue6aT36Amjxf8pv8yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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