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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb50b51ab21b550e192bdf323b9752c01ca41d3f7be689e48634d29aa61ae66' 
  AND token = 'ojV/r+bRjAjHY0KowaqAEXj2DmG8G2D3wGQik+1umXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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