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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef62c05c624e2afb5da45b86d8437c08549d3f3ab30e50793badf4a665fc9159' 
  AND token = 'VfziTq0+pm88zDoNps5FRrkFNfAnXk4mzYBbgTi3OIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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