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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42764b8bcf41cc1aa57a8e33b4fd074ff07487f69b2e31b4004bdae6b52201ec' 
  AND token = '0YifCMWNmNWxNabWchghA5eE5jwPxLku80GLLD2BQ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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